Summary of Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2015

Accounting Policies [Abstract]

Basic and Diluted Net Loss per Share Computations

The following is a reconciliation of the numerators and denominators of the basic and diluted net loss per share computations:

	Three months ended June 30,						Six months ended June 30,
	2015			2014			2015			2014
Net loss from continuing operations	$	(8,461,714	)	$	(11,970,735	)	$	(17,812,415	)	$	(19,533,263	)
Net loss from discontinued operations		—			(144,489	)		—			(202,217	)
Net loss	$	(8,461,714	)	$	(12,115,224	)	$	(17,812,415	)	$	(19,735,480	)
Weighted average shares outstanding used to compute basic and diluted net income or loss per share		95,190,823			55,711,717			82,277,137			55,529,818
Basic and diluted net loss per share from continuing operations	$	(0.09	)	$	(0.22	)	$	(0.22	)	$	(0.36	)
Basic and diluted net loss per share from discontinued operations		—			—			—			—
Basic and diluted net loss per share	$	(0.09	)	$	(0.22	)	$	(0.22	)	$	(0.36	)

Outstanding Options, Warrants and Restricted Stock Units

The following outstanding potentially dilutive securities were excluded from the computation of diluted net income or loss per share because the effect would have been anti-dilutive as of June 30:

	2015		2014
Options		2,765,229		375,670
Restricted stock units		9,358,518		3,137,440
Warrants		53,882,369		14,207,426
Total		66,006,116		17,720,536